Disazo dye.



separates the dye in flocks.

' doncentrated 7 solution, the dye an erm ne PATENT v onerous FRITZ ACKERMANN, 0F BERLIN-FRIEDENAU, GERMANY, ASSIGNOR T0 ACTIEN GESELLSCHAFT Fi'IR ANILIN FABRIKATION, OF

BERLIN, GERMANY.

DISAZO DYE.

No Drawing.

Hogs

Ac EnMANN, a

It may be manufactured by combining 1 molecule of tetrazotized 4.il'-diarninodi-'f 'phenylurea wlth'l molecule of 2-amino-8- naphthol-G-sulfonic acid in an acidmedium and 1 molecule of resorcinol.

The sodium salt forms a black -brown powder soluble in water with a red-brown color. 011 addition of sodiumhydroxid the solution becomes more reddish. When acidified with hydrochloric acid the solution The dye is dissolved by concentrated sulfuric acid to a brownish-red solution'from which the dye is precipitated again by adding ice. Strong reducing agents discolorize the dye yielding 4.4 diaminodiphenylurea, 1.2 diamino 8 naphthol-6-sulfonic acid and aminoresorci- 1101. The dye produces .on-cottonin a neutral or alkaline bath reddish brown shades W'hich soluble in water with a red-brown color,. turning to more reddish on dium hydroxid. and separating the dye in flockswhen acidified;"being dissolved by sulfuric acid to a brownish red by adding ice; yieldlng upon reduction 4.4 diaminodiphenylurea,'1.2 -'-diamino 8 naphthol-6-sulfonic acid and aminoresorci- Specification of Letters Patent.

. r Application filedl March 22, 1915. Serial N o.

manner by means of 50 addition of so- 7 being precipitated again Patented Feb. 22, 19th.

useful Improvements in Disazo Dye, of

which the following is a specification.

The present invention relates to a disazo probably corresponding to the fordye most mula bec'ome fast to washing when treated with an aldehyde, such as formaldehyde.

Example: phenylurea are tetrazotized in the known parts of hydrochloric acid 12 B. and 6.9. p'artsof sodium nitrite. \Vhile stirring a neutral solution made from 12 parts of Q-amino-S-naphthol- 6-sulfonic acid and sodium carbonate slowly flows hereto. After the mass is stirred for a good time 21 partsof crystallized sodium acetate are added. The intermediate product runs into a solution made of 5.8 parts of resorcinol,6 parts of caustic soda lye 40 B. and 18.5 parts of calcined sodium carbonate. The dye is worked up as usual.

I claim- The herein-described disazodye having most probably the formula:

nesses. I

FRITZ ACKERMANN.

Witnesses I v HnNRrHAsPnR, ,WoLnEMAR HA PT.

12.1 parts ofLAJ-diaminOdi- 

